linux-kernel - Re: [PATCH v2 2/2] mm,thp,compaction,cma: allow THP migration for CMA allocations

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Message-ID: <aa39b1d9-96c1-c75b-d09b-4dbacdad2f46@suse.cz>
Date:   Mon, 2 Mar 2020 10:32:54 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        mhocko@...nel.org, mgorman@...hsingularity.net,
        rientjes@...gle.com, aarcange@...hat.com, ziy@...dia.com
Subject: Re: [PATCH v2 2/2] mm,thp,compaction,cma: allow THP migration for CMA
 allocations

On 2/27/20 10:32 PM, Rik van Riel wrote:
> The code to implement THP migrations already exists, and the code
> for CMA to clear out a region of memory already exists.
> 
> Only a few small tweaks are needed to allow CMA to move THP memory
> when attempting an allocation from alloc_contig_range.
> 
> With these changes, migrating THPs from a CMA area works when
> allocating a 1GB hugepage from CMA memory.
> 
> Signed-off-by: Rik van Riel <riel@...riel.com>
> Reviewed-by: Zi Yan <ziy@...dia.com>

With the followup fix,

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

Thanks.